Description of problem:
I just installed kernel-2.6.40.3-0.fc15.x86_64.rpm

and I found that readlink on an empty path now sets errno to EINVAL.


This is not POSIX compliant, man 3 readlink says that ENOENT should be put 
in errno 
if path is an empty string.


Version-Release number of selected component (if applicable):


How reproducible:
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
int main()
{
char buffer[256];
ssize_t n;
n=readlink("",buffer,256);
perror("errno from readlink:");
if( errno != ENOENT) printf("n=%d errno=%d\n",n,errno);
return 0;
}

Steps to Reproduce:
1. Compile
2. Run
3.
  
Actual results:
Invalid argument

Expected results:
No such file or directory

Additional info:
Until 2.6.38.8-35 readlink gave the correct errno. 
This is running readlink03 from ltp-full-20110606.